ZK-7921 WiFi 6 Communication Module
Product Information
The ZK-7921 is a WiFi 6 communication module designed by Diao
Pengjun. It can be used with laptops, computers, TVs, and set-top
boxes. The module operates with a minimum distance of 20cm between
the radiator and the user’s body. The model is Wi-Fi 6, 2T2R and
has absolute maximum ratings that define levels at which permanent
damage to the device can occur. The module should not be used or
stored in a corrosive atmosphere, especially where chloride gas,
sulfide gas, acid, alkali, salt, or moisture are present.
Assembling the modules should be done within 6 months, and the
soldering ability should be checked in case of 6 months over.
Product Usage Instructions
To use the ZK-7921, follow these instructions:
- Install the module on your laptop device, computer, TV, or
set-top box. - Ensure that there is a minimum distance of 20cm between the
radiator and your body while using the device. - Do not use or store the module in a corrosive atmosphere,
especially where chloride gas, sulfide gas, acid, alkali, salt, or
moisture are present. - Store the module where the temperature and relative humidity do
not exceed 5 to 40 and 20 to 60%. - Assemble the modules within 6 months and check the soldering
ability in case of 6 months over.
USER MANUAL
The information contained herein is the exclusive property of ZK and shall not be distribwritten permission of ZK
Version
Date2022.8.31
MODEL NAME: ZK-7921,ZK-7921AU-TV,ZK-7921US, ZK-7921-M2AE,ZK-7921-DG,ZK-7921-DGX, ZK-7921-PC
PRODUCT NAME : WiFi 6 communication module
DESIGN Diao Pengjun
CHECK
APPROVAL
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1. Features
ZK-7921 is the small size and low power module for IEEE 802.11a/b/g/n/ac/axwirelessLAN. ZK-7921 is based on MT7921AUN solution.IEEE802.11a/b/g/n/ac/axDual Band WLAN infrastructure Size : 100.3mmx 50.5mmx 11.5mm 2.4GHz&5GHZ &BT5.2 Support 1024QAM Support 2*2 MU-MIMO,OFDMA Rate up to 1774.5Mbps Operation mode STA,AP,P2P USB2.0*1 Supports drivers for Windows/Linux/Android Security:WPA3,WPA2,WPS2.0,WAPI,WEP,T KIP,CKIP,AES,GCMP,SMS4 · Application: DTV, DVR, HD DVD Player, Blue-ray Disk Player, STB
This equipment could be used on a laptop device, computer, TV and set-top box, but it needs to be installed and operated with minimum distance 20cm between the radiator & your body.
2. Ordering Information
Model ZK-7921
Description Wi-Fi6 , 2T2R
3. Absolute Maximum Ratings
Caution : The specifications in Table 1 define levels at which permanent damage to
the device can occur. Function operation is not guaranteed under these conditions.
Operating at absolute maximum conditions for extend periods can adversely affect the
long-term reliability of the device.
Parameter
Min
Storage Temperature
-10
Max +70
Unit
Storage Humidity (40)
–
90
%
< Table 1 Absolute Maximum Ratings > . Other conditions 1) Do not use or store modules in the corrosive atmosphere, especially where chloride gas, sulfide gas, acid, alkali, salt or the like are contained. Also, avoid exposure to moisture. 2) Store the modules where the temperature and relative humidity do not exceed 5 to 40 and 20 to 60%.
3) Assemble the modules within 6 months. Check the soldering ability in case of 6 months over.
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4. Operating Conditions
Parameter
Operating Temperature
Operating Humidity
Supply Voltage1
VDD
Min
Typ
Max
Unit
-10
–
70
–
–
90
%
5.0
V
5.Standard Test Conditions
The Test for electrical specification shall be performed under the following condition unless otherwise specified.
1). Ambient condition Temperature :25 ± 5
. Humidity:65% ± 5% R.H. 2). Power supply voltages
3.3V (±5%) input power at the Module
3). Current consumption over recommended range of supply voltage and operating conditions is like below. When it’s tested, it must be supplied more than 2 times of maximal current.
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6. Electrical Specifications
1) DC Characteristics
Current Consumption
Min.
peak
–
TX Mode ( MCS7)
–
Idle and Associated state
–
Typ. 1A 340 160
Max. –
Unit mA
Radio disabled state
–
20
–
2) RF Characteristics for IEEE802.11b ( 11Mbps mode unless otherwise specified)
Items
Contents
Specification
IEEE802.11b
Mode
DSSS/CCK
Channel frequency
2400 ~ 2483 MHz
Data rate
1,2,5.5,11Mbps
TX Characteristics
Min.
Typ. Max.
Power Level Spectrum Mask
15
17
19
1st side lobes ( to fc ±11MHz) 2nd side lobes ( to fc ±22MHz) Modulation Accuracy (EVM)
–
-43
-30
–
-58
-50
–
30
30
Power On/Off ramp Freq. Tolerance Chip Clock Freq. Tolerance RX Characteristics Minimum Input Level Sens (FER 8%) Maximum Input Level (FER 8%)
* Normal Condition : 25, VDD=3.3.
-15 -15 Min.
-10
0.5 –
Typ. -86
–
2.0 15 15 Max. -76 –
Unit dBm
dBr dBr
% Usec ppm ppm Unit dBm dBm
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3) RF Characteristics for IEEE802.11g ( 54Mbps mode unless otherwise specified)
Items
Contents
Specification
IEEE802.11g
Mode
OFDM
Channel frequency
2400 ~ 2483 MHz
Data rate
6,9,12,18,24,36,48,54Mbps
TX Characteristics Power Level
Min. 13
Typ. 15
Max. 17
Spectrum Mask
at fc ±11MHz
–
-32
-20
at fc ±20MHz
–
-43
-28
at fc ± 30MHz
–
-48
-40
Constellation Error (EVM)
–
-34
-28
Freq. Tolerance
-15
–
15
Chip Clock Freq. Tolerance
-15
–
15
RX Characteristics
Min.
Typ.
Max.
Minimum Input Level Sens. (PER 10%)
–
-75
–
Maximum Input Level (PER 10%)
-20
–
–
*Normal Condition : 25, VDD=3.3
Unit dBm
dBr dBr dBr dB ppm ppm Unit dBm dBm
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4) RF Characteristics for IEEE802.11n ( MCS7 mode unless otherwise specified)
Items
Contents
Specification
IEEE802.11n
Mode
HT20/40
Channel frequency Data rate TX Characteristics Power Level
2400 ~ 2483 MHz
6.5,13,19.5,26,39,52,58.5,65,13.5,2 7,40.5,54,81,108,121.5,135Mbps
Min. Typ. Max. Unit
12
14
16 dBm
Spectrum Mask
at fc ±11MHz
–
-32
-20
dBr
at fc ±20MHz
–
-43
-28
dBr
at fc ± 30MHz
–
-48
-40
dBr
Constellation Error (EVM)
–
-35
-29
dB
Freq. Tolerance
-15
–
15
ppm
Chip Clock Freq. Tolerance
-15
–
15
ppm
RX Characteristics
Min. Typ. Max. Unit
Minimum Input Level Sens.(HT20,PER 10%) –
-73
-66
dBm
Minimum Input Level Sens.(HT40,PER 10%) –
-70
-63
dBm
Maximum Input Level (PER 10%)
-20
–
–
dBm
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5) RF Characteristics for IEEE802.11a ( 54Mbps mode unless otherwise specified)
Items Specification Mode Channel frequency Data rate TX Characteristics Power Level Spectrum Mask at fc ±11MHz at fc ±20MHz at fc ± 30MHz Constellation Error (EVM) Freq. Tolerance Chip Clock Freq. Tolerance RX Characteristics Minimum Input Level Sens. (PER 10%) Maximum Input Level (PER 10%)
Contents
IEEE802.11a – 5GHz OFDM
5150~5650MHz, 5725 ~ 5850 MHz
6,9,12,18,24,36,48,54Mbps Min. Typ. Max. Unit
13
15
17
dBm
-15 -15 Min.
-30
-32 -35 -45 -35 Typ.
-75 –
-20 -28 -40 -28 15 15 Max.
-68 –
dBr dBr dBr dB ppm ppm Unit
dBm dBm
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6) RF Characteristics for IEEE802.11n ( MCS7 mode unless otherwise specified)
Items
Contents
Specification
IEEE802.11n – 5GHz
Mode
11N HT20/40
Channel frequency
5150~5650MHz, 5725 ~ 5850 MHz
Data rate TX Characteristics
MCS0~MCS7 Min. Typ.
Max. Unit
Power Level Spectrum Mask
12
14
16
dBm
at fc ±11MHz
–
-32
-20
dBr
at fc ±20MHz
–
-35
-28
dBr
at fc ± 30MHz
–
-45
-40
dBr
Constellation Error (EVM)
–
-35
-29
dB
Freq. Tolerance
-15
–
15
ppm
Chip Clock Freq. Tolerance
-15
–
15
ppm
RX Characteristics
Min. Typ. Max. Unit
Minimum Input Level Sens.(HT20,PER 10%) –
-76
-64
dBm
Minimum Input Level Sens.(HT40,PER 10%) –
-73
-61
dBm
Maximum Input Level (PER 10%)
-30
–
–
dBm
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7) RF Characteristics for IEEE802.11ac
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Items
Contents
Specification
IEEE802.11ac – 5GHz
Mode Channel frequency Data rate
HT80 5150~5650MHz,5180~5825 MHz,5725 ~ 5850 MHz MCS0~MCS11
TX Characteristics
Min. Typ. Max. Unit
Power Level
11
13
15
dBm
Spectrum Mask
at fc ±11MHz
–
-32
-20
dBr
at fc ±20MHz
–
-35
-28
dBr
at fc ± 30MHz
–
-45
-40
dBr
Constellation Error (EVM)
–
-35
-29
dB
Freq. Tolerance
-15
–
15
ppm
Chip Clock Freq. Tolerance
-15
–
15
ppm
RX Characteristics
Min. Typ. Max. Unit
Minimum Input Level Sens.(HT80,PER 10%) –
-68
-61
dBm
Maximum Input Level (PER 10%)
-30
–
–
dBm
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8) RF Characteristics for IEEE802.11ax
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Items
Contents
Specification
IEEE802.11ax – 5GHz
Mode Channel frequency Data rate
HT80 5150~5650MHz,5180~5825 MHz,5725 ~ 5850 MHz MCS0~MCS11
TX Characteristics
Min. Typ. Max. Unit
Power Level
11
13
15
dBm
Spectrum Mask
at fc ±11MHz
–
-32
-20
dBr
at fc ±20MHz
–
-35
-28
dBr
at fc ± 30MHz
–
-45
-40
dBr
Constellation Error (EVM)
–
-35
-29
dB
Freq. Tolerance
-15
–
15
ppm
Chip Clock Freq. Tolerance
-15
–
15
ppm
RX Characteristics
Min. Typ. Max. Unit
Minimum Input Level Sens.(HT80,PER 10%) –
-67
-61
dBm
Maximum Input Level (PER 10%)
-30
–
–
dBm
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7.Bluetooth Specification
Bluetooth Specification Conditions : VBAT=3.3V ; Temp:25°C
Feature General Specification Bluetooth Standard Host Interface Antenna Reference Frequency Band Number of Channels Modulation RF Specification
Output Power (Class 1.5) Output Power (Class 2) Sensitivity @ BER=0.1% for GFSK (1Mbps) Sensitivity @ BER=0.01% for /4-DQPSK (2Mbps) Sensitivity @ BER=0.01% for 8DPSK (3Mbps)
Maximum Input Level
Description
Bluetooth 5.2 BLE USB /SDIO/UART Small antennas with 0~2 dBi peak gain 2.400 GHz ~ 2483.5 GHz 80 channels FHSS, GFSK, DPSK, DQPSK
Min.
Typical. 10 2 -86
-86
-80
GFSK (1Mbps):-20dBm /4-DQPSK (2Mbps) :-20dBm 8DPSK (3Mbps) :-20dBm
Max.
34.5mm
16.0mm 2.5m2m.0mm
457 ±5mm
17.5mm 3.5mm
12.±0.3mm
3.8mm
7.5mm10.0mm
6.2mm
12.0m m 15.8mm
3.15mm
10.0mm
3.15mm 2.5mm
7.5mm 3.8mm
2.0mm
100.3mm
50.5mm
11.0mm 11.5mm
40mm
20mm
The device supports BT and WIFI functions. It is in conformity with the relevant Union harmonization legislation: Radio Equipment directive: 2014/53/EU. 5G Wifi alerts and restricted country codes The device is restricted to indoor use only when operating in the 5150 to 5350 MHz frequency range.
This equipment complies with CE radiation exposure limits set forth for an uncontrolled environment. This equipment should be installed and operated with minimum distance of 20 cm between the radiator and your body.
CE mark
Any Changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment. This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) this device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.
Note: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which
can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures: -Reorient or relocate the receiving antenna. -Increase the separation between the equipment and receiver. -Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. -Consult the dealer or an experienced radio/TV technician for help.
This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment. This equipment should be installed and operated with minimum distance 20cm between the radiator & your body.
Ren Røros
